Creasing rule



April 19, 1938'. K..WEHNER.ET AL 2,114,948

CREASING RULE Filed May 21, 1937 I v 7P2] 7 .Fea

Patented Apr. 19, 1938 ATET OFFIE.

4 Claims.

This invention relates to creasing rules em ployed in creasing cardboard stock in the manufacture of boxes and cartons, being generally associated with cutting rules, the creasing and cutting rules being set up as a. die in the chase of a press so that the entire box or carton blank is stamped out at one operation with the necessary cuts and creased lines of fold.

The cutting rules are fiat steel pieces of any desired length, with one longitudinal edge sharpened to form a knife edge. The creasing rules are of exactly the same height as the cutting rules, but are fiat on the edge corresponding to the knife edge of the cutting rule, and of different thickness depending upon the thickness of the stock to be creased, since the same gauge of creasing rule will not make a proper crease in all thickmesses of stock.

The conventional cutting rule is invariably of 2 point thickness (a point .01383'7 of an inch), while the creasing rules usually are made of two point, 4 point and 6 point thickness, the thickness being uniform throughout the body of the rule.

It may be readily understood that a cutting rule r and a 2 point creasing rule placed end to end can be clamped tight in a chase between parallel blocks of uniform thickness, but that a cutting rule and either a 4 point or 6 point creasing rule so placed, cannot be clamped between 9 blocks of uniform thickness, but it is necessary in order to have the cutting rule line with the creasing rule to use either a 4 or 2 point lead as the case may require, or cardboard strips alongside the cutting rule to build it up to the thickness of the creasing rule, or to cut the blocks of smaller thickness where they must clamp against the creasing rule.

This causes considerable loss of time and lacks accuracy and even accurately done, it may cause the die to spring when locked in the chase. Many times the dies will bulge and break while being used in the process of cutting. In nearly all such cases, this means not only losing the die, but also a broken cutting press which brings production to a standstill.

The present invention has for its object the provision of a creasing rule having the base portion, that is, the portion which clamps between the blocks of the die of the same thickness as the cutting rule and the face portion of different desired t 'ilCkZlESS as, for example, 2 point, 4 point, 6 point, etc.

Other objects of the invention will appear as the following description of a preferred and practical embodiment thereof proceeds.

In the drawing which accompanies and forms a part of the following specification, and throughout the several figures of which the same characters of reference have been employed to designate identical parts:

Figure l is a bottom plan view of a chase with a die set up and clamped therein including cutting and creasing rules embodying the features of the present invention;

Figure 2 is a section taken along the line 22 of Figure 1;

Figure 3 is a section taken along the line of Figure 1;

Figures 4 and 5 are sections through creasing rules of different thickness illustrating their creasing operation upon different gauge stock;

Figure 6 is a perspective View through a portion of creasing rule constructed according to the principles of the invention; and

Figure 7 is a perspective View showing a cutting rule in end to end relation with a creasing rule, illustrating uniformity in the thickness of those portions of the rules which are to be clamped in longitudinal alignment.

Referring now in detail to the several figures, the numeral i represents in general a chase comprising the rectangular metallic frame 2 having clamps 3 at one end and one side thereof, the usual furniture consisting of Wooden blocks A and 5, all of the same width and thickness, but cut to suitable lengths to correspond to the lengths of rule with which they are to be set up.

The numerals 6 and I represent lengths of creasing rule, which are set up in respective endwise relation to shorter pieces of cutting rule 8 and 9. The arrangement of cutting and creasing rules as shown is adapted to out and crease a blank for the bottom or top of a rectangular box having four sides defined by creased lines of fold and with the corner portions cut away.

Referring to certain specific blocks designated as a and b these like the other blocks, are of uniform width and thickness. Therefore if the cutting rule 8 were of 2 point thickness and the creasing rule 6 of 4 point thickness throughout, it would be impossible to clamp both rules up tightly between the blocks a and b for when the blocks b were in tight engagement with the 4 point creasing rule 6, the 2 point cutting rule 8 would be loose in the space between the blocks a. This is the condition which attends the use of cutting and creasing rules of the type at present employed.

In order to make the cutting rule tight it is necessary to fiank it on both sides with pieces of cardboard of suitable thickness or with pieces of lead. As has been stated in connection with the objects of the invention it is quite unusual that the buliding up of the thickness of the cutting rule to that of the creasing rule can be done with accuracy, the result being that when the die is clamped up in the chase, the unequal pressure in various parts of the die will cause the die to bulge and break out from the chase in the act of pressing which means not only losing the die, but breaking the rule and the press.

Figure 1 however does not disclose the supposed case where cutting and creasing rules with bases of different thickness are used, but it illustrates the present invention in which the bases of the creasing rules are all of 2 point thickness, the same as that of the cutting rule regardless of whether the faces of the creasing rules are of 2 point, 6 point, or any other point thickness.

Figures 2 and 3 are comparative, showing that the base portion 10 of the creasing rule is of the same thickness as the cutting rule 9, but that the face H of the creasing rule is of the desired thickness, for example, 4 point, as shown. It is quite evident that since the bases of both the cutting and creasing rules are of the same thickness it is an easy matter to clamp them up in the chase between the blocks of the die without having to build up the thickness of the base of the cutting rule and without the necessity of cutting thinner those blocks between which the creasing rules are clamped.

It will be observed from the several figures and particularly Figures 2 and 3 that the blocks 4 and 5 are of the same thickness and it is preferred to make the base portion of the creasing rule of a width equal substantially to the thickness of the blocks so that when the creasing rule is clamped between the blocks the thin portion of the creasing rule will be fully supported by the blocks substantially throughout its entire height.

The employment of creasing rules of different width is made necessary through the fact that a single width of creasing rule is not practical for creasing all widths of cardboard. Figures 4 and 5 illustrate the action of creasing rules [2 and I3, being respectively of 2 point and 4 point thickness increasing pieces of stock l4 and [5 respectively of different thickness.

It will be apparent that creasing rules embodying the principles of our invention may be used in end to end or in any other relation with 2 point cutting rules and that they are freely interchangeable, without the necessity of employing any expedient for building up the thickness of the thinner rule so as to enable it to be clamped uniformly with respect to the thicker rule.

While we have in the above invention disclosed what we believe to be a preferred and practical embodiment of the same, it will be understood to those skilled in the art that the details of construction as illustrated and described are merely by way of example and not to be construed as limiting the scope of the invention as defined in the appended claims.

What we claim is:

1. In a box blank cutting and creasing die, in combination with means having parallel equispaced clamping faces, a cutting rule and a creasing rule having base portions both of the same thickness adapted to be clamped between said faces, said creasing rule having a portion including the working face thicker than said base portion.

2. creasing rule adapted to be clamped in end to end relation with a cutting rule of standard thickness, between the parallel equi-spaced faces of clamping members in a chase, the creasing rule having the base portion which is engageable by said clamping means, of the same thickness as the cutting rule, and having a portion including the working face, of greater thickness than the base portion.

3. Creasing rule comprising a metal piece having a base portion of uniform thickness throughout adapted to be clamped between blocks in a chase, and a portion including the working face adapted to project from said blocks said last named portion being thicker than said base portion.

4. In combination a creasing rule and cutting rule adapted to be arranged end to end between equi-spaced clamping members, and of such height as to project above said members, portions of said creasing and cutting rules which are adapted to be engaged by said clamping members being of equal and uniform thickness throughout, the projecting portion of said creasing rule being of greater thickness than the portion which is adapted to be clamped between said clamping members.

KARL WEHNER. RALPH REAY. 

